Soil temperature is one of the leading azonal factors determining microclimate, vegetation cover, microflora formation of unique ecosystems of geothermal areas. Its large-scale mapping is extremely important for providing basic information about habitats’ features both for conservation of unique landscapes and conducting biological research in these areas. This paper presents the results of GIS-based modeling of thermal fields of the Valley of the Geysers (Kronotsky State Natural Biosphere Preserve) and demonstrates the possibility of such modelling on basis of vegetation cover characteristics collected during field studies. Comparison of our map with similar maps, conducted using other methods, demonstrates the relevancy of presented approach.